 $(function(){
		$(":input[name='userName']").change(function(){
			var val = $(this).val();			
			val = $.trim(val);
			$("#message").html("");
			if(val != ""){
				var url = "um-checkName";
				var args = {"checkUserName":val,"time": new Date()};
				$.post(url,args,function(data){
					$("#message").html(data);
				});
			}
		});		
});
